Question

what is a rational/irrational number??

Answer 1

http://www.themathpage.com/aprecalc/rational-irrational-numbers.htm

Answer 2

A rational number is any number that can be expressed as \(\displaystyle\frac{p}{q}\) where \(p, q \in \mathbb{Z}\)

Answer 3

If the number cannot be expressed as previously mentioned it is irrational

Answer 4

A few other things, the closure of Q is the reals. To be more specific, Q together with its limit points make up R, those limit points for Q but not in Q are the irrational numbers.